Angular velocity
Velocity Ve*loc"i*ty, n.; pl. {Velocities}. [L. velocitas, from velox, -ocis, swift, quick; perhaps akin to v?lare to fly (see {Volatile}): cf. F. v['e]locit['e].] [1913 Webster] 1. Quickness of motion; swiftness; speed; celerity; rapidity; as, the velocity of wind; the velocity of a planet or comet in its orbit or course; the velocity of a cannon ball; the velocity of light. [1913 Webster]

Note: In such phrases, velocity is more generally used than celerity. We apply celerity to animals; as, a horse or an ostrich runs with celerity; but bodies moving in the air or in ethereal space move with greater or less velocity, not celerity. This usage is arbitrary, and perhaps not universal. [1913 Webster]

2. (Mech.) Rate of motion; the relation of motion to time, measured by the number of units of space passed over by a moving body or point in a unit of time, usually the number of feet passed over in a second. See the Note under {Speed}. [1913 Webster]

{Angular velocity}. See under {Angular}.

{Initial velocity}, the velocity of a moving body at starting; especially, the velocity of a projectile as it leaves the mouth of a firearm from which it is discharged.

{Relative velocity}, the velocity with which a body approaches or recedes from another body, whether both are moving or only one.

{Uniform velocity}, velocity in which the same number of units of space are described in each successive unit of time.

{Variable velocity}, velocity in which the space described varies from instant, either increasing or decreasing; -- in the former case called accelerated velocity, in the latter, retarded velocity; the acceleration or retardation itself being also either uniform or variable.

{Virtual velocity}. See under {Virtual}. [1913 Webster]

Note: In variable velocity, the velocity, strictly, at any given instant, is the rate of motion at that instant, and is expressed by the units of space, which, if the velocity at that instant were continued uniform during a unit of time, would be described in the unit of time; thus, the velocity of a falling body at a given instant is the number of feet which, if the motion which the body has at that instant were continued uniformly for one second, it would pass through in the second. The scientific sense of velocity differs from the popular sense in being applied to all rates of motion, however slow, while the latter implies more or less rapidity or quickness of motion. [1913 Webster]

Syn: Swiftness; celerity; rapidity; fleetness; speed. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

### Look at other dictionaries:

• Angular velocity — Angular An gu*lar, a. [L. angularis, fr. angulus angle, corner. See {Angle}.] 1. Relating to an angle or to angles; having an angle or angles; forming an angle or corner; sharp cornered; pointed; as, an angular figure. [1913 Webster] 2. Measured… …   The Collaborative International Dictionary of English

• Angular velocity — Do not confuse with angular frequency The unit for angular velocity is rad/s.In physics, the angular velocity is a vector quantity (more precisely, a pseudovector) which specifies the angular speed, and axis about which an object is rotating. The …   Wikipedia

• angular velocity — Physics. the time rate of change of angular position of a rotating body, usually expressed in radians per second or radians per minute. [1810 20] * * *  time rate at which an object rotates, or revolves, about an axis, or at which the angular… …   Universalium

• angular velocity — kampinis greitis statusas T sritis automatika atitikmenys: angl. angular speed; angular velocity vok. Winkelgeschwindigkeit, f rus. угловая скорость, f pranc. vitesse angulaire, f …   Automatikos terminų žodynas

• angular velocity — kampinis greitis statusas T sritis Standartizacija ir metrologija apibrėžtis Vektorinis dydis, lygus kūno pasisukimo kampo pirmajai išvestinei pagal laiką: ω = dφ/dt; čia dφ – pasisukimo kampo pokytis, dt – laiko tarpas. Kai kūnas sukasi tolygiai …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• angular velocity — kampinis greitis statusas T sritis fizika atitikmenys: angl. angular speed; angular velocity vok. Winkelgeschwindigkeit, f rus. угловая скорость, f pranc. vitesse angulaire, f …   Fizikos terminų žodynas

• angular velocity — noun (physics) the rate of change of the angular position of a rotating body; usually expressed in radians per second or radians per minute • Topics: ↑physics, ↑natural philosophy • Hypernyms: ↑speed, ↑velocity …   Useful english dictionary

• angular velocity — noun The angle turned, in a given time, by a body rotating about an axis; the rate of rotation through an angle. See Also: angular acceleration …   Wiktionary

• angular velocity — rate of change of angular displacement …   English contemporary dictionary

• angular velocity — /æŋgjələ vəˈlɒsəti/ (say anggyuhluh vuh losuhtee) noun the rate of change of the angular displacement of a moving body about an axis; in SI units, measured in radians per second …   Australian English dictionary